Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Portsmouth experiences its lowest average temperatures in January, reaching a peak of 45.9°F (7.7°C) and a minimum of 34.7°F (1.5°C).Humidity
In January, the average relative humidity is 75%.Rainfall
In Portsmouth, in January, during 8.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Throughout the year, there are 151.9 rainfall days, and 20.35" (517mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall in Portsmouth. The month with the most snowfall is January, when snow falls for 2.2 days and typically aggregates up to 0.47" (12mm) of snow.Ocean temperature
In Portsmouth, Virginia, the average seawater temperature in January is 45.5°F (7.5°C).Note: Swimming in 45.5°F (7.5°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
In January, the average length of the day is 9h and 59min.On the first day of January in Portsmouth, Virginia, sunrise is at 7:17 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:28 pm EST.
Sunshine
The average sunshine in January in Portsmouth, Virginia, is 5.5h.UV index
January is the month with the lowest UV index, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 in January translates into this advice:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
What month is the coldest in Portsmouth?
What are January temperatures in Portsmouth?
What is the average humidity in January in Portsmouth?
How much does it rain in Portsmouth in January?
What is the snowiest month in Portsmouth?
How much does it snow in Portsmouth in January?
How cold is the water in January in Portsmouth?
What is the average length of the day in January in Portsmouth?
When are sunrise and sunset in January in Portsmouth?
How long on average sun shines in January in Portsmouth?
What is the month with the lowest UV index in Portsmouth?
How high is the UV index in January in Portsmouth?
Average temperature in January
Portsmouth, VA
- Average high temperature in January: 45.9°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (45.9°F).
- Average low temperature in January: 34.7°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).
Average pressure in January
Portsmouth, VA
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in January
Portsmouth, VA
- Average wind speed in January: 10.1mph
The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in January
Portsmouth, VA
- Average humidity in January: 75%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and November (74%).
Average rainfall in January
Portsmouth, VA
- Average rainfall in January: 1.3"
The wettest month (with the highest rainfall) is August (2.52").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in January
Portsmouth, VA
- Average rainfall days in January: 8.4 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in January
Portsmouth, VA
- Average snowfall in January: 0.47"
The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Portsmouth, VA
- Average snowfall days in January: 2.2 days
The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in January
Portsmouth, VA
- Average sea temperature in January: 45.5°F
The best month for swimming (with the highest average sea temperature) is August (80°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).
Average daylight in January /
Average sunshine in January
Portsmouth, VA
- Average daylight in January: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January: 5h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in January
Portsmouth, VA
- Average sunshine days in January: 19 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is August (10.8 days).
Average UV index in January
Portsmouth, VA
- Average UV index in January: 2
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in January
Portsmouth, VA
- Average cloud cover in January: 39
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in January
Portsmouth, VA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Portsmouth, Virginia, USA
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